Waterproof cement



ll atented Hen. 3,1929 I y Y i i .3 NlTED STATES PATENT OFFICE I JEROME P. srrnnssnn, on NEW YonK, N,

- wn'trnnrnoor CEMENT ltlo Drawing. Application fllerl ifune 28, 19%. Serial No. 722,945.

My invention relates to improvements in Another feature oi. my invention consists cements and in the method of preparing the in the manner in which the parts are comimprovement. The object of my invention is bined. I have found that the better way is to produce a strong cement which can be to combine the asphaltum with the dextrine in 5 easily made and used, and which is waterthe form of a solution, and to accomplish the proof and adapted for a great variety of right mixture, it is desirable to heat the asnses. l[ have found that by properly comphaltum to a liquid condition, and raise the bining asphaltum and dextrine, the latter contemperature of the dextrine solution to a taining preferably borax and a preservative higher degree, and then mingle the two. If

and astringent, suchtor instance as for the two liquids are mixed at the same temrnaldehyde, I obtain a cement having the perature, the mixture froths and does not water-proofing characteristics of asphaltum, properly combine; but if, for example, the and the adhesive qualities of the asphalt-um asphaltum is raised to a temperature of say greatly augmented by the adhesive qualities 175 F. and the dextrine solution to 185 F,

of the dextrine, and the borax which the dexthen the two will combine without frothing trine contains, and the added astringent preand will make a homogeneous mixture. The servative tends further to strengthen, toughsolution of deirtrine serves as an excellent caren, and keep the mixture in shape for proper rier for the asphaltum, and when they are use. lthe proportions of the asphaltum and combined as stated, the asphaltum is emulsi- 29 the dentrine glue with its other constituents tied, and globules are held in suspension in W as stated, vary according to the use to which the dextrine solution. I "the cement is to be put and the nature of the We will assume thata heavy cement is to be asphaitum. made and that the base is what is known as it great diiticulty with most asphaltum is commercial refined asphaltum. For such that it substantially solidifies at normal temheavy cement I use asphaltum and 50% peratures, and therefore can only be used deXtrine solution, the dextrine solution bewhen hot, and a difliculty of dextrine glue is ing composed of approximately 50% dex' that it is hygroscopic, and under damp contrine, 3% borax, 10% formaldehyde, and the ditions soi'tens andceases to serve its proper balance water. The'above is simply by way,

30 function. By combining the two, however, I of example. Obviously the water content of :5 produce an adhesive or cement having the the dextrine solution should be diminished as waterproofing properties of asphaltum and the water content of the asphaltum is inthe adhesiveness or tackiness of dextrine. The creased. Furthermore, the water content of consistency of the resulting composition can the cement as a whole will vary with the de- 35 be varied over a wide range depending upon sired body of the mixture. It, for instance, the use to which it is to be put. For example, the cement is to be used for laying linoleum,

ll can have the cement thus formed of heavy cork, rubber tile, floor coverings and the like, body requiring a trowel or the like to apply it should be heavy, and the water content will it, or can have it liquid so that it can be apbe relatively small. It it is to be used as a to plied with a brush, or will coat the substance coating for paper, or to cement paper sur- S5 immersed in it. Thus it will be seen that the faces, or other things of like nature, the water proportions of the asphaltum and the deX- content should be larger, and likewise a largtrine solution mixed with it can vary widely er water content should beused where the and still come Within the scope of my i'nven cement was used as a dust layer for roads,

tion. in which case it should naturally be thin tion.

turn and a more or. less hygroscopic adhesive like dextrine glue, and the method of mingling the parts, rather than in any precise combination of the dextrine and asphaltum. This is evident when it is considered that the asphaltum varies so greatly in its nature, and that it is sometimes manufactured fromoil residuums, and is often a natural product. In some cases it is very hard at normal temperatures, in others it is plastic, and in others semi-liquid, and obviously the water content of the dextrine glue would vary in proportion as the asphaltum was thick or thin. In

some of the rather liquid asphaltums the dextrine need contain very little water.

While the method of mingling described is usually the preferred, method, in some cases the dextrine and asphaltum may be mixed in a mixing machine, the formaldehyde added, and the parts agitated and mingled until a uniform mixture results. In any event the ultimatecement is a homogeneous non-hygroscopic mixture Y containing the water proofing characteristics of the asphaltum, the adhesive qualities of the dextrine and asphaltum, and does not solidify at normal temperatures, so that it can be conveniently used under ordinary conditions.

I have referred to formaldehyde as a preservative, and I find this entirely suitable, but other preservatives, and especially astringent preservatives of the aldehyde group, might be substituted without affecting the invention.

may vary properties of adhesiveness tothe composi-' The examples given make it clear that my invention lies in the combination of asphal-' combining the two heated mixtures at the said relative temperatures.

2. An adhesive composition comprising a homogeneous mixture of substantially the following proportions by weight:

i Per cent Asphaltum 5O Dextrine 25 Water 23.45 Borax 1 5 In testimony whereof, I have signed my name to this specification this 27th day of June, 1924.

JEROME P. STRASSER.

It will be noted that the dextrine solution acts as a carrier for the asphaltum, enabling the mixture to be used in conveniently liquid form, and the asphaltum gives the necessary water-proofing and body elements; If applied where exposed to the Weather, the water will gradually evaporate, leaving the combined asphaltum and dextrine in a heavy enduring mass.

I claim 1. The herein described method of mixing asphaltum and a dextrine solution to form a .cement, which comprises the steps of raising the asphaltum to a liquefying temperature,

raising the dextrine solution to a temperature higher than that of the asphaltum, and then 

